wake_up vs. wake_up_sync

From: Scott Long (scott@swiftview.com)
Date: Wed Jun 27 2001 - 15:18:43 EST

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I'm having trouble understanding the difference between these.
Synchronous apparently causes try_to_wake_up() to NOT call
reschedule_idle() but I'm uncertain what reschedule_idle() is doing. I
assume it just looks for an idle CPU and makes that CPU reschedule.

What is the purpose of wake_up_sync? Why would you want to prevent
reschedule_idle()?

Scott
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